All Patents in class 137/425


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All Patents in class 137/425
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
2,112,220	Mar. 22, 1938	P.S. Russel	Control Device	flow controls
2,317,556	Apr. 27, 1943	P.S. Russel	Liquid Level Controlling Means	liquid level controls